[Jboss-dev-forums] [Design of EJB 3.0] - Re: @EmbeddableSuperclass does not works as expected !

[llucifer <nu...@jb...>]

"epbernard" wrote : 
  | You need to explicitly list your embedded superclasses in your persistence.xml

I'm using 4.0.3RC1 and have the same problem. I tried your tip but it fails. This is the persistence.xml I have:

<entity-manager>
  |     <class>foo.EmbeddedSuperClass</class>
  | </entity-manager>
  | 

Where EmbeddedSuperClass is

@Embeddable
  | @EmbeddableSuperclass
  | public class EmbeddableSuperClass implements java.io.Serializable {
  | 
  | ...
  | }

and DerivedClass is

@Entity
  | @Inheritance(strategy=InheritanceType.JOINED)
  | public class DerivedClass extends  EmbeddableSuperClass implements Serializable{
  | ...
  | }

But the properties derived from EmbeddableSuperClass are note created in the database. Is there a "conflict" because EmbeddableSuperClass is used as a @EmbeddableClass and a @Embeddable?

This kind of hierachy is driven by the following design. I have some global types which act as a default value and which are used as embedded instantec as well as in many-to-one relations. An example would be contract detail. In each order instance I have a reference to a "GlobalContractDetail" which is an instance of a ContractDetail and a used contract detail which store a snapshop of the GlobalContractDetail used a time of creation of the order. In my usecase I have a hierachie of ContractDetail. So the actual class model is:

@Embeddable, @EmbeddableSuperClass ContractDetail  with basic properties.
@Entity GlobalContractDetail extends ContractDetail  which adds a PK to ContractDetail
Order has a @many-to-one to GlobalContractDetali and a @embedded ContractDatail which stores the snapshot.

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